Add hz parameter validation to WarThunder factory methods

[Copilot]

The CreateStateSource and CreateIndicatorsSource factory methods used hz as a divisor without validation, causing divide-by-zero errors when hz <= 0.

Changes:

• Added ArgumentOutOfRangeException validation in both factory methods to reject non-positive hz values
• Validation occurs before poll interval calculation to fail fast with clear error messages

public static StateSource CreateStateSource(string? baseUrl = null, int hz = 60)
{
    if (hz <= 0)
        throw new ArgumentOutOfRangeException(nameof(hz), hz, "Polling frequency must be greater than 0");
    
    var pollInterval = TimeSpan.FromMilliseconds(1000.0 / hz);
    return new StateSource(baseUrl ?? DefaultBaseUrl, pollInterval);
}

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